Anomalies of the femoral vessels occur in only 0.02% of the population, most of them being asymptomatic. The study highlights the anomalies of femoral vessels in the femoral triangle and the importance of their recognition intra-operatively to prevent injuries.Here we present a case of bilateral transposition of femoral vessels in the femoral triangle, which was detected during groin dissection in a case of carcinoma penis with inguinal lymph node metastasis.We detected the anomalous transposition intra-operatively during groin dissection on the left side and the right sided anomaly postoperatively by CT angiography.The importance of this anomaly lies in procedures for which vascular access is need through the femoral vessels and groin surgeries like Trendelenburg operation for varicose veins where not appreciating these anomaly could lead to inadvertent vascular injury or bleeding.